Active elastic mount

Abstract

An active elastic mount for the insulated mounting of an assembly affected by vibration, in particular an internal combustion engine in a motor vehicle, includes an active decoupling system disposed on an insulated side of the mount. The active decoupling system has a permanent magnetic field. A coil vibrates in the permanent magnetic field. A decoupler mass is coupled to the coil for high-frequency vibration. A sensor detects predetermined operating parameters as a function of which the decoupler mass can be set into vibration electrodynamically. Two radially rigid, mutually parallel spring systems extend transversely to the coil and elastically suspend the coil for exact vertical guidance of the coil.

We claim: 
     
       1. An active elastic mount for the insulated mounting of an assembly affected by vibration, comprising: an insulated side of the mount, an active decoupling system disposed on said insulated side, said active decoupling system having a permanent magnetic field, a coil vibrating in said permanent magnetic field, a decoupler mass coupled to said coil for high-frequency vibration, a sensor for detecting predetermined operating parameters as a function of which said decoupler mass can be set into vibration electrodynamically, and two radially rigid, mutually parallel spring systems extending transversely to said coil and elastically suspending said coil for exact vertical guidance of said coil; wherein said decoupler mass is disposed immediately adjacent said coil, said decoupler mass has a vertical and a radial length, said decoupler mass is surrounded in each of two mutually spaced apart planes by a respective one of said spring systems allowing a vertical motion, and said decoupling system has a rigid abutment on which said spring systems are supported.   
     
     
       2. The mount according to claim 1, wherein said spring systems include annular springs. 
     
     
       3. The mount according to claim 2, wherein said decoupler mass has a prismatic cross section with upper and lower ends and is tightly surrounded by said annular springs at said upper and lower ends. 
     
     
       4. The mount according to claim 3, including supports for said abutment, said annular springs including substantially concentric inner and outer spring rings and radial ribs joining said spring rings together on a diameter, said inner spring rings being fixed on said decoupler mass, and said outer spring rings having retaining eyelets formed therein being offset by 90° from said radial ribs for receiving said supports. 
     
     
       5. The mount according to claim 4, wherein said inner spring rings have a center, and said outer spring rings have halves with centers disposed slightly outside said center of said inner spring rings. 
     
     
       6. The mount according to claim 4, wherein said two annular springs are disposed offset from one another by 90° relative to said supports. 
     
     
       7. The mount according to claim 2, wherein said decoupler mass has a cylindrical cross section with upper and lower ends and is tightly surrounded by said annular springs at said upper and lower ends. 
     
     
       8. The mount according to claim 7, including supports for said abutment, said annular springs including substantially concentric inner and outer spring rings and radial ribs joining said spring rings together on a diameter, said inner spring rings being fixed on said decoupler mass, and said outer spring rings having retaining eyelets formed therein being offset by 90° from said radial ribs for receiving said supports. 
     
     
       9. The mount according to claim 8, wherein said inner spring rings have a center, and said outer spring rings have halves with centers disposed slightly outside said center of said inner spring rings. 
     
     
       10. The mount according to claim 8, wherein said two annular springs are disposed offset from one another by 90° relative to said supports. 
     
     
       11. The mount according to claim 1, wherein said spring systems include diaphragms being rigid in the radial direction. 
     
     
       12. The mount according to claim 1, wherein said decoupler mass has an upper end surface, a bar-like additional mass on said upper end surface protruding laterally beyond said decoupler mass, said additional mass having projecting ends with lower surfaces, and rubber cushions on said lower surfaces of said projecting ends serving as a motion stop toward the top of said abutment. 
     
     
       13. The mount according to claim 1, including a permanent magnet producing said permanent magnetic field, said permanent magnet having an upper surface with an annular gap formed therein into which said coil is inserted.